JP3253654B2 - Vacuum press lamination molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finishing a surface of a molded base material having a three-dimensional shape, such as cabinets, furniture, containers, etc. of various audio and visual equipments, in order to perform surface finishing such as decoration. The present invention relates to a vacuum press laminating and forming method suitable for laminating and forming a decorative sheet such as a transfer sheet or a sticking sheet provided with a pattern or the like along the pattern.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 32-9785, Japanese Patent Publication No.
Similarly, as described in JP-A-56-45768, the upper chamber and the lower chamber are partitioned by a decorative sheet, and the upper chamber is pressurized and the lower chamber in which the molding base is disposed is depressurized by vacuum suction. It is known that a decorative sheet is made to adhere along the outer surface of a forming substrate by causing a pressure difference between the two and heating and softening the decorative sheet substantially simultaneously with the pressure difference. This method generally assumes the case where the decorative sheet is a sticking sheet, but can also be applied when the decorative sheet is a transfer sheet,
In this case, after the sheets are bonded, only the release substrate sheet is peeled off, leaving a transfer portion.

However, in the above-described method, since the decorative sheet is directly heated by an infrared heater or the like, it is difficult to uniformly heat and soften the decorative sheet, and wrinkles and partial adhesion failure occur. Easy to do. In addition, since the decorative sheet is pressed against the forming base material only by the pressure difference, the pressing force on the forming base material side of the decorative sheet may be insufficient or partially non-uniform. In the case of a formed base material having a large curvature at the step of the unevenness or at the end or the local portion of the outer surface, the decorative sheet cannot be completely adhered to the unevenness or the curvature, and adhesion failure is likely to occur.

[0004] In order to solve the above-mentioned problems,
For example, Japanese Utility Model Publication No. 46-9276 and Japanese Patent Publication No. 60-580
As described in Japanese Patent Application Publication No. 14 (1994) and the like, a sheet-side chamber having a rubber-like elastic film disposed opposite to a decorative sheet to be adhered to a molding substrate and a suction stage on which the molding substrate is arranged are provided. A substrate-side chamber is prepared, and the air in the substrate-side chamber is evacuated by vacuum to generate a pressure difference between the chambers so that the rubber-like elastic film is pressed against the decorative sheet. A vacuum press laminating method is proposed in which the decorative sheet is pressed against the outer surface of the molding base with a rubber-like elastic film by heating the film, and the decorative sheet is softened and adhered by the heat of the rubber-like elastic film. Have been.

[0005]

According to the conventional vacuum press lamination molding method as described above, not only the pressure difference between the chambers but also the pressing force of the rubber-like elastic film is applied to the decorative sheet and the rubber-like elastic film is removed. Since the decorative sheet is substantially uniformly heated through the process, the problem of uneven heating and softening of the decorative sheet or insufficient pressing force on the decorative sheet can be solved to some extent.

[0006] However, when the decorative sheet is actually adhered to the forming substrate and laminated and formed by such a method, the resulting molded product completely removes the air existing between the forming substrate and the decorative sheet at the time of laminating. Often remain in the form of bubbles without falling out, and this residual bubble causes a problem that blistering, transfer failure, wrinkles, etc. occur on the outer surface of the product. Even if the residual air bubbles are not conspicuous at the time of completion of the lamination molding, they may cause blistering or peeling off depending on the subsequent temperature conditions and the like, which significantly deteriorates the quality of the obtained molded product.

The following can be considered as a cause of this. That is, in the conventional vacuum press lamination molding method, when the decorative sheet is pressed along the outer surface of the molding base by the rubber-like elastic film and is brought into close contact with the molding base in a softened state, the air is slightly, but the molding base is in contact with the molding base. It is sealed between the decorative sheet and the adhesive layer disposed on the back side of the decorative sheet or the outer surface of the molding base at that time, or the adhesiveness (fusibility) of the decorative sheet itself And a part of the decorative sheet is adhered to the molding base even during lamination molding. With the decorative sheet adhered in this way, even if vacuum suction is performed, air remaining inside the bonded portion cannot be sucked and degassed to the outside. Therefore, even after the completion of the lamination molding, the air remains as bubbles.

[0008] From the above reasons, the above-mentioned problem is caused when the molding base material is a wood molded article having air permeability, the air remaining between the molding base material and the decorative sheet is a vacuum. It can be avoided because it can be degassed to the outside through the molding base by suction.However, if the molding base is a synthetic resin molded article without air permeability, it cannot be avoided unless new measures are taken. .

In view of the foregoing, the present invention solves the above-mentioned problems of the conventional vacuum press laminating method by applying not only a pressure difference between chambers but also a pressing force by a rubber-like elastic film to a decorative sheet. By heating the decorative sheet through the rubber-like elastic film, the heating and softening of the decorative sheet can be made uniform, and a sufficient pressing force can be applied to the decorative sheet. It is an object of the present invention to provide a novel vacuum press laminating method capable of minimizing blisters, transfer defects, wrinkles, etc. on the outer surface caused by air remaining between the vacuum press lamination. .

[0010]

In order to achieve the above-mentioned object, the present invention is to dispose a molding substrate on a suction table provided in a substrate-side chamber and to form the molding substrate on an outer surface of the molding substrate. A decorative sheet is set, and a rubber-like elastic film provided in the sheet-side chamber is arranged to face the decorative sheet to generate a pressure difference between the sheet-side chamber and the substrate-side chamber. By heating the film, the decorative sheet is pressed against the outer surface of the molding base by the rubber-like elastic film and softened and bonded so as to be adhered. After suctioning and degassing the air present between the base material-side chamber and activating the adhesive interposed between the molding base material and the decorative sheet, or粧 to express adhesion sheet,
Disclosed is a vacuum press lamination molding method characterized by bonding the two.

[0011] The present invention further provides a molding substrate disposed on a suction table provided in a substrate-side chamber, and a decorative layer formed on a release substrate sheet on an outer surface of the molding substrate. A transfer decorative sheet provided with an adhesive layer as necessary thereon is set so that the decorative layer side faces the molding base material side, and a rubber-like elastic film provided in a sheet-side chamber is provided on the transfer decorative sheet. The transfer decorative sheet is disposed by opposing to generate a pressure difference between the sheet-side chamber and the substrate-side chamber, and by heating the rubber-like elastic film, the transfer decorative sheet is formed by the rubber-like elastic film into the molding base material. In the vacuum press laminating method for pressing and softening the outer surface of the sheet and bonding the same, the air existing between the forming base material and the transfer decorative sheet is suctioned and deaerated to the base material side chamber. , Whether to activate the adhesive that has been allowed to intervene between the molding substrate and the transfer decorative sheet,
Alternatively, the adhesiveness of the decorative layer itself of the transfer decorative sheet is developed, and the two are adhered to each other. Thereafter, the pressing of the rubber-like elastic film is stopped, and only the releasable base sheet of the transfer decorative sheet is used. Also disclosed is a vacuum press lamination molding method characterized by removing.

In carrying out the vacuum press lamination molding method of the present invention, a conventionally known vacuum press apparatus can be used as a basic component as it is. The decorative sheet to be bonded and laminated in the method of the present invention includes both a synthetic resin transfer sheet and a bonding sheet (laminated laminated sheet), and may be a sheet-like material other than resin such as a veneer, The adhesive layer formed or coated on the back surface side or the adhesive layer formed or coated on the molding substrate side, and the adhesiveness of itself is activated or developed by heat or the like. Adhered to the molding substrate.

The transfer sheet is composed of a release base sheet and a transfer layer, and the base sheet is made of a material to be transferred (mold base material) such as a resin molded product made by injection molding. When the surface is generally a curved surface, a polyvinyl chloride, polyamide such as nylon 6, nylon 66, polyethylene,
Polyolefins such as polypropylene, polyethylene terephthalate, low-crystalline polyesters such as polyethylene terephthalate-isophthalate copolymer, polyvinyl chloride, vinylon, etc., a flexible thermoplastic resin film, or a laminate thereof is used as appropriate. The release layer provided as necessary includes a thermosetting acrylic, melamine, urethane, polyester, aminoalkyd for the purpose of flexibility, heat resistance during molding, prevention of seizure between the release layer and the transfer layer, and the like. It is preferable to use one or a mixture of two or more resins such as epoxy and epoxy resins. On the other hand, the decorative transfer layer is usually composed only of a pattern layer (however, a thermoplastic resin is used as a binder and also serves as a heat-sensitive adhesive layer, and a dye, a pigment, and the like are added). And a release layer, a pattern layer, and a heat-sensitive adhesive layer, and a release layer and a pattern layer. These are cellulose resin, styrene resin, acrylic resin, vinyl resin, and rosin ester. A natural or synthetic resin such as a system resin or a polyamide resin is appropriately used, and a printing ink pattern, partial metal deposition of aluminum or the like is applied to the picture layer.

The above-mentioned laminated sheet is composed of a base sheet and a heat-sensitive adhesive layer. In order to impart design properties and industrial functions to the base sheet, various kinds of pattern printing, metal deposition, etc. are used. Decoration processing, chemical or physical processing, or the like is appropriately performed. In addition, when the adhesive laminated sheet itself has adhesiveness, and when an adhesive layer is formed or applied on the molding base material side, the heat-sensitive adhesive layer can be omitted. Corona discharge treatment, various types of primer coating, and the like may be performed in order to improve the adhesiveness with the molding base according to the conditions. The material of the base sheet is a film having thermoplasticity. In addition to the material of the release base sheet, an acrylic resin, ABS (acrylonitrile-butadiene-styrene copolymer), and polystyrene can also be used. In this case, releasability is not required.

For the heat-sensitive adhesive layer used for bonding the above-mentioned transfer sheet and adhesive laminated sheet, a thermoplastic resin, an ionomer or the like can be appropriately used. As the resin, for example, ethyl cellulose, cellulose nitrate, cellulose acetate, ethyl hydroxyethyl cellulose, cellulose derivatives such as cellulose acetate propionate, polystyrene, styrene resin such as poly α-methylstyrene or styrene copolymer, polymethyl methacrylate, Polyethyl methacrylate, polyethyl acrylate,
Acrylic resin such as polybutyl acrylate, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, vinyl polymer such as polyvinyl butyral, rosin, rosin-modified maleic resin, Rosin modified phenol resins, rosin ester resins such as polymerized rosin, and the like can be mentioned.

Here, in the vacuum press laminating method according to the present invention, the temperature of the heat-sensitive adhesive used for bonding the decorative sheet is determined by the temperature at which the decorative sheet is activated by the heat applied to the outer surface of the molding base. It is desirable that the temperature is higher than the temperature at which the material softens to the extent that the temperature is adjusted (hereinafter, referred to as softening temperature).
Therefore, the specific material of the adhesive is appropriately selected in relation to the material and thickness of the laminated decorative sheet used for molding or the shape of the outer surface of the molding base material. For example, the softening temperature of a polyvinyl chloride sheet, which is frequently used as a material of a decorative sheet, particularly as a material excellent in moldability, is about 60 to 90 ° C, and the softening temperature of an ABS sheet is about 90 to 100 ° C. The activation temperature of the above series of heat-sensitive adhesives is usually 10
Since the temperature is higher than 0 ° C., a material meeting other conditions may be appropriately selected from them. As the adhesive, other than the heat-sensitive adhesive, an adhesive activated under conditions other than heat may be used.

The forming base material to be bonded in the vacuum press laminating method of the present invention is not only a plate-like body such as a flat plate and a curved plate, but also a relatively complicated three-dimensional object having an uneven portion or the like. The material is not particularly limited, and may be any of wood, synthetic resin, metal, ceramics, etc., but the feature of the present invention is a three-dimensional synthetic resin molded product having no air permeability, or metal molding. It is used for porcelain, impervious porcelain, hard porcelain, and glazed porcelain. In this case, examples of the material of the synthetic resin molded product include ABS, polystyrene, acrylic, polyvinyl chloride, and phenol resin.

In the vacuum press lamination molding method of the present invention, the time at which air existing between the molding base material and the decorative sheet is suctioned and deaerated is determined when the decorative sheet is not yet adhered to the molding substrate. More specifically, specifically, before the decorative sheet is heated and softened, or when the decorative sheet is heated and softened but the adhesive layer is lower than the activation temperature. In the present invention, the adhesive is activated after suction and deaeration between the molding base material and the decorative sheet. In this case, the decorative sheet is heated and softened so as to be along the outer surface of the molding base material. It is more preferable to activate the adhesive after the adhesive is adhered to the adhesive.

[0019]

In the vacuum press laminating method according to the present invention having the above-described structure, not only the pressure difference between the chambers but also the pressing force by the rubber-like elastic film is applied to the decorative sheet and the rubber sheet is applied through the rubber-like elastic film. By heating the decorative sheet, the decorative sheet is heated and softened uniformly, and a sufficient and uniform pressing force is applied to the decorative sheet. In addition, the activation of the adhesive interposed between the molding base material and the decorative sheet or the development of the adhesiveness of the decorative sheet is caused after the molding base material and the decorative sheet are suctioned and degassed. Done.

Therefore, at the time of suction and deaeration, the decorative sheet is not yet adhered to the forming base material, so that the air existing between the forming base material and the decorative sheet is reliably and completely eliminated and remains there. Disappears. As a result, blisters, transfer defects, wrinkles, and the like on the outer surface, which are caused by air remaining between the molding base material and the decorative sheet, are significantly reduced, and the quality of the obtained molded product is remarkably improved.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a main part of an example of a vacuum press laminating apparatus used for carrying out the method of the present invention. The vacuum press laminating and forming apparatus 10 includes a seat-side chamber 11 connected to the tip of a piston rod 13 of a fluid pressure cylinder device 12 having an automatic locking function supported on a support frame (not shown) and vertically moved up and down. And a base-side chamber 21 mounted on a fixed machine base not facing the sheet-side chamber 11.

The seat-side chamber 11 has a box shape with a lower opening, and a rubber-like elastic film 14 such as silicon rubber having heat resistance and elasticity is stretched over the lower opening so as to close the lower surface opening. A plurality of heaters 15 of infrared or far-infrared type are attached to the ceiling surface in a predetermined manner, and a supply / discharge port for supplying / discharging air to / from the chamber 11 is provided on one side surface. 16 are formed.

On the other hand, the substrate-side chamber 21 has a box shape with an upper opening, and a plate-shaped suction table 22 having a large number of through holes 23 formed in a predetermined arrangement is attached to the upper opening. On one side, this chamber 2
Supply / exhaust port 2 for supplying / exhausting air to / from 1
6 are formed. A base mounting table 6 for supporting and fixing the forming base 5 at the time of lamination molding is attached to a central portion on the upper surface side of the suction mounting base 22. Although the mounting table 6 can be omitted, it is preferable to use the mounting table 6 in order to make the decorative sheet follow the side surface of the molding base 5 or even a part of the back surface. As shown in FIG. 1, it is preferable to use a mounting table 6 that is narrower than the molding base 5.

Although not shown, the supply / discharge ports 16 and 26 are selectively connected to a compressor and a vacuum pump through three-way switching valves, respectively. Substrate side chamber 2
1 can be depressurized or pressurized or kept at a constant pressure from an open-to-air state. Also, the amount of heat generated by the heater 15 can be controlled by controlling the amount of power supply, the time of power supply, the phase flow angle, and the like.

This apparatus is merely an example, and in the present invention, essentially all conventionally known vacuum press laminating apparatuses can be used as they are. Next, a procedure for carrying out the vacuum press lamination molding method according to the present invention using the vacuum press lamination molding apparatus having the above-described configuration will be described. Embodiment 1: In this example, first, as shown in FIG.
A molding base 5 made of synthetic resin having a three-dimensional shape is positioned and installed on a base mounting table 6, and on the molding base 5,
The decorative sheet 1 having the heat-sensitive adhesive layer 3 formed on the back surface (lower surface) is set. Here, as the decorative sheet 1, for example, a vinyl chloride sheet is used as a base sheet, and an acrylic resin is used as the heat-sensitive adhesive layer 3.

When the decorative sheet 1 is set, the heating operation of the heater 15 is not yet performed, the temperature of the decorative sheet 1 (hereinafter, referred to as sheet temperature Ts) is maintained at approximately room temperature, and the substrate side chamber 21 The suction of the air inside is started. Next, the sheet-side chamber 11 is lowered as shown in FIG. 2, and the outer peripheral end of the rubber-like elastic film 14 is pressed against the suction table 22, and the entire decorative sheet 1 is covered with the rubber-like elastic film 14.

In this state, the heater 15 generates heat and pressurized air is supplied to the seat-side chamber 11 to increase the internal pressure. As a result, the rubber-like elastic film 14 is heated and softened and pressed against and adheres to the decorative sheet 1, the heat of the rubber-like elastic film 14 is gradually conducted to the decorative sheet 1, and the decorative sheet 1 is heated and softened. However, at this point, the decorative sheet 1 softens but does not yet completely follow the outer surface of the molding base 5, and the sheet temperature Ts is higher than the softening temperature of the decorative sheet 1 but the activation of the heat-sensitive adhesive layer 3 is activated. Lower than the temperature. Subsequently, in such a state, the sealed space D surrounded by the inside of the substrate-side chamber 21, the rubber-like elastic film 14, the side peripheral portions of the molded substrate 5 and the substrate mounting table 6, and the upper surface of the suction mounting table 22. Then, air existing in a space G surrounded by the upper surface of the molding base material 5 and the rubber-like elastic film 14 (hereinafter referred to as an under-film molding space) is completely sucked and deaerated. Thereby, as shown in FIG. 3, the entire decorative sheet 1 comes into close contact with the outer surface of the molding base material 5. Then, the sheet temperature Ts
The heating operation of the heater 15 is continued so that the temperature becomes equal to or higher than the activation temperature of the heat-sensitive adhesive layer 3, and when the heat-sensitive adhesive layer 3 is activated, the entire decorative sheet 1 adheres to the outer surface of the molding base 5. Glued in state.

After the bonding of the decorative sheet 1 is completed in this way, before the melting point of the decorative sheet 1 is reached, the heating operation of the heater 15 is stopped, and the sheet-side chamber 11 and the base-side chamber 21 are respectively set to the atmosphere. And the pressure is returned to the atmospheric pressure, and the sheet-side chamber 11 is raised to take out the laminated molded product in which the decorative sheet 1 is adhered to the molding base 5.

As described above, in this embodiment, the chambers 11 and 12
In addition to the pressure difference between them, the pressing force by the rubber-like elastic film 14 is applied to the decorative sheet 1 and the decorative sheet is heated via the rubber-like elastic film 14, so that the softening of the decorative sheet 1 by heating is uniform. It is performed and the decorative sheet 1
A sufficient and uniform pressing force is applied. In addition, when the decorative sheet 1 is heated and softened via the rubber-like elastic film 14, when the sheet temperature Ts is lower than the activation temperature of the heat-sensitive adhesive layer 3, the air in the under-film forming space is suctioned and desorbed. Since the heat-sensitive adhesive layer 3 is activated, the heat-sensitive adhesive layer 3 is activated after the space between the molding base material 5 and the decorative sheet 1 is suctioned and deaerated.

Therefore, at the time of suction and deaeration, the decorative sheet 1 is not yet adhered to the forming base material 5, so that the air existing between the forming base material 5 and the decorative sheet 1 is reliably and completely eliminated. Will not remain. As a result, blisters, transfer defects, wrinkles, and the like on the outer surface, which are caused by air remaining between the molding base material 5 and the decorative sheet 1, are significantly reduced, and the quality of the obtained molded product is remarkably improved. I do.

In the first embodiment, after the decorative sheet 1 is heated to the softening temperature or higher, suction and deaeration of the sub-membrane molding space is performed. However, it is not always necessary to do so. Alternatively, the suction and deaeration of the sub-membrane molding spaces D and G may be performed without heating the decorative sheet 1 and thus at a temperature lower than the softening temperature. In this case, the decorative sheet 1 does not follow the outer surface of the molding base 5 even if suction and deaeration of the sub-membrane molding space is performed, but if the decorative sheet 1 is thereafter heated to a softening temperature or higher, it softens. If the decorative sheet 1 is further adhered to the forming base material 5 and further heated, the heat-sensitive adhesive layer 3 is activated and adhered to the forming base material 5, so that the same operation and effect as in the above example can be obtained.

Example 2 In this example, as shown in FIGS. 4 and 5, a heat insulating sheet having an area capable of covering the entire upper surface of the decorative sheet 1 between the decorative sheet 1 and the rubber-like elastic film 14 is shown. 4, the heat from the heater 15 is conducted from the rubber-like elastic film 14 to the decorative sheet 1 via the heat insulating sheet 4, and the decorative sheet 1 is heated from the start of the heat generation operation of the heater 15, and the heat-sensitive adhesive is applied. The period up to the activation temperature of the layer 3 is extended, in other words, the temperature of the heat-sensitive adhesive layer 3 is raised so that the heat-sensitive adhesive layer 3 is activated after the suction and deaeration of the sub-membrane molding space is performed. The timing of the temperature is delayed.

That is, first, the rubber-like elastic film 14 is heated by energizing the heater 15 to generate heat. This heating is appropriately selected depending on the material and thickness of the decorative sheet 1 and the heat insulating sheet 4 to be used, but is usually heated to about 100 to 150 ° C. Next, the sheet-side chamber 11 is lowered to remove the rubber-like elastic film 14 that has already been softened by heating.
To the decorative sheet 1. Thereby, the heat of the rubber-like elastic film 14 is conducted from the heat insulating material 4 to the decorative sheet 1, and the decorative sheet 1 is heated and softened. In this process, the inside of the sheet-side chamber 11 is pressurized, and the inside of the substrate-side chamber 21 and the inside of the under-film forming space are suctioned and deaerated. As a result, the heat-softened decorative sheet 1 adheres to the outer surface of the molding base 5, but at this time, the activation temperature of the heat-sensitive adhesive layer 3 has not yet been reached. Then, after the air is completely removed from the under-film forming space, the sheet temperature Ts is raised to the activation temperature of the heat-sensitive adhesive layer 3 or more.

Therefore, also in this example, the decorative sheet 1
Is adhered to the molding base 5 after the air between them is completely degassed, so that the same operation and effect as in the first embodiment can be obtained. The specific material, thermal conductivity, thickness, etc. of the heat insulating sheet are determined by the thermal conductivity of the decorative sheet 1, the rate of pressurization / decompression of the sheet-side chamber 11, and the base-side chamber 21,
The heat generation amount of the heater 15, the thermal conductivity of the rubber-like elastic film 14, the softening temperature of the decorative sheet 1, and the like may be appropriately selected in consideration of, for example, a silicone resin containing silicone rubber,
Polyethylene terephthalate, polyimide, polyethylene naphthalate, viton rubber, polyvinylidene fluoride,
Examples of the resin include fluorine resin including fluorine rubber, and resins such as nylon, polyvinyl chloride, polyethylene, polypropylene, and polyolefin. In other words, the resin has thermoplasticity equal to or higher than that of the decorative sheet 1, and has a softening point to a melting point of the decorative sheet 1. It is sufficient that the material has heat resistance and releasability to the extent that it does not flow or stick to the decorative sheet even when heated and pressed, and if necessary, the surface is treated to improve releasability. You may.

Embodiment 3 In this embodiment, as shown in FIG. 6, first, the pressure in the sheet-side chamber 11 is reduced so that the rubber-like elastic film 14 becomes convex (to be drawn into the chamber 11). ), And, if necessary, heat the heater 15 to heat the rubber-like elastic film 14. Next, as shown in FIG. 7, the rubber-like elastic film 14 is lowered with the upwardly convex rubber-like elastic film 14 attached thereto, and the rubber-like elastic film 14 is brought into close contact with the suction table 22 and the decorative sheet 1. Thereby, the heat of the rubber-like elastic film 14 is conducted to the decorative sheet 1 and the decorative sheet 1 is heated and softened. In this process,
The inside of the sheet-side chamber 11 is changed from decompression to pressurization, and the inside of the substrate-side chamber 21 and the inside of the under-film forming space are suctioned and deaerated. As a result, the heat-softened decorative sheet 1 adheres to the outer surface of the molding base 5, but at this time, the activation temperature of the heat-sensitive adhesive layer 3 has not yet been reached. Then, after the air is completely removed from the under-film forming space, the sheet temperature Ts is raised to the activation temperature of the heat-sensitive adhesive layer 3 or more.
Therefore, in this example also, the decorative sheet 1 is
Is bonded after the air between them is completely degassed, so that the same operation and effect as in the first embodiment can be obtained.

In this case, when making the rubber-like elastic film 14 convex upward, although not particularly shown, the film 14 is pulled up further than shown in FIG. When the molding space is sucked after completely separating
Degassing can be performed more efficiently. Embodiment 4: In this example, first, as shown in FIG.
The seat-side chamber 11 is pressurized so that the rubber-like elastic film 14 is made to protrude downward (protrude from the chamber 11). Heat. In this state, the vicinity of the lower top of the rubber-like elastic film 14 is in close contact with the decorative sheet 1, and the top surface of the decorative sheet 1 is heated and pressed by the rubber-like elastic film 14 on the top surface. Air is excluded from the section. Next, as shown in FIG. 9, the rubber-like elastic film 7 is applied to the decorative sheet 1 while the sheet-side chamber 11 is accompanied by the above-mentioned rubber-like elastic film 14 that is convex downward.
Lower while making close contact with Thereby, in the decorative sheet 1, from the upper part to the lower part of the molding base material, from the vicinity of the center to the peripheral part, the portion where the rubber-like elastic film 14 adheres is heated and softened. The air is eliminated, and finally, the outer peripheral end of the rubber-like elastic film 14 comes into pressure contact with the suction table 22 to be in a state as shown in FIG. In this process, the inside of the sheet-side chamber 11 is pressurized, and the inside of the substrate-side chamber 21 and the inside of the under-film forming space are suctioned and deaerated. As a result, the heat-softened decorative sheet 1 adheres to the outer surface of the molding base 5, but at this time, the activation temperature of the heat-sensitive adhesive layer 3 has not yet been reached. Then, after the air is completely removed from the under-film forming space, the sheet temperature Ts is raised to the activation temperature of the heat-sensitive adhesive layer 3 or more. Therefore, also in this example, the decorative sheet 1 is adhered to the molding base 5 after the air between them is completely degassed, so that the same operation and effect as in the first embodiment can be obtained. Can be

In carrying out the vacuum press lamination molding method according to the present invention as described above, as shown in FIG. 10, a frame plate 30 is arranged on a suction table 22 so as to surround the molding base 5. Thus, the sealing of the sub-membrane molding spaces D and G can be reliably and easily performed, and the air in the spaces can be effectively sucked.

[0038]

As can be understood from the above description, according to the vacuum press lamination molding method of the present invention, not only the pressure difference between the chambers but also the pressing force by the rubber-like elastic film is applied to the decorative sheet and the rubber-like elastic film is formed. , The decorative sheet is heated through, and thus the decorative sheet can be heated and softened uniformly, and a sufficient and uniform pressing force can be applied to the decorative sheet. And in addition to that, activation of the adhesive interposed between the molding base material and the decorative sheet or the development of the adhesiveness of the decorative sheet,
This is performed after suction and deaeration between the molding base material and the decorative sheet.At the time of suction and deaeration, the air present between the molding base material and the decorative sheet is not yet adhered to the molding base material. It is reliably and completely eliminated and no longer remains there.

As a result, blisters, transfer defects, wrinkles, and the like on the outer surface, which are caused by air remaining between the molding base material and the decorative sheet, are significantly reduced, and the quality of the obtained molded product is remarkably reduced. The effect of improving is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram used for explaining a main part of an example of a vacuum press laminating apparatus used in carrying out a method of the present invention and a procedure of a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a procedure according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a procedure according to the first embodiment of the present invention;

FIG. 4 is a diagram for explaining a procedure according to a second embodiment of the present invention;

FIG. 5 is a diagram for explaining a procedure according to a second embodiment of the present invention;

FIG. 6 is a diagram for explaining a procedure according to a third embodiment of the present invention;

FIG. 7 is a diagram for explaining a procedure according to a third embodiment of the present invention;

FIG. 8 is a diagram used for describing a procedure according to a fourth embodiment of the present invention.

FIG. 9 is a diagram used for describing a procedure according to a fourth embodiment of the present invention.

FIG. 10 is a diagram which is used for describing a modified example of an example of a vacuum press lamination molding apparatus used when performing the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative sheet 4 Heat insulation sheet 5 Mold base material 6 Substrate mounting table 10 Vacuum press lamination molding device 11 Sheet side chamber 12 Cylinder device 14 Rubbery elastic film 15 Heater 16, 26 Supply / discharge port 21 Base material side chamber 22 Suction table 23 Through-hole 30 frame plate

Continuation of the front page (56) References JP-A-5-57786 (JP, A) JP-A-3-230935 (JP, A) JP-A-3-94792 (JP, A) JP-A-57-197124 (JP) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 63/00-63/48 B29C 51/00-51/46

Claims (2)

(57) [Claims] 1. A molding base is arranged on a suction table provided in a substrate side chamber, a decorative sheet is set on an outer surface of the molding base, and a rubber-like elastic member provided in the sheet side chamber. A film is disposed opposite to the decorative sheet to generate a pressure difference between the sheet-side chamber and the substrate-side chamber, and the rubber-like elastic film is heated to heat the rubber-like elastic film. In the vacuum press lamination molding method, wherein the air is pressed between the molding substrate and the decorative sheet, the air existing between the molding substrate and the decorative sheet is suctioned and removed to the substrate side chamber. After a while, activate the adhesive interposed between the molding base and the decorative sheet, or express the adhesiveness of the decorative sheet,
A vacuum press lamination molding method characterized by bonding the two. 2. A molding base is arranged on a suction table provided in a substrate side chamber, and a decorative layer is formed on a release base sheet on an outer surface of the molding base and further on the molding base. A transfer decorative sheet provided with an adhesive layer as necessary is set such that the decorative layer side faces the molding base material side, and a rubber-like elastic film provided in a sheet-side chamber is arranged to face the transfer decorative sheet. By causing a pressure difference between the sheet-side chamber and the substrate-side chamber, and heating the rubber-like elastic film, the transfer decorative sheet is transferred to the outer surface of the molding substrate by the rubber-like elastic film. In a vacuum press laminating method for softening and adhering to the substrate, the air present between the molding substrate and the transfer decorative sheet is suctioned and deaerated to the substrate side chamber, and then the molding substrate is Activate the adhesive interposed between the transfer decorative sheet and the transfer decorative sheet, or express the adhesiveness of the decorative layer itself of the transfer decorative sheet, and bond them both, and then, the rubber-like A vacuum press laminating method, wherein the pressing of the elastic film is stopped and only the releasable base sheet of the transfer decorative sheet is removed.